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            <h1>我的第一个 Bootstrap 页面</h1>
            <span>重置窗口大小，查看响应结果</span>
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                    <h2>第一列</h2>
                    <p>学的不仅是技术，更是梦想</p >
                    <p>再牛逼的梦想，也抵不住你的坚持</p >
                    </div>
                    <div class="col-md-3 col-xs-12 col-sm-6">
                    <h2>第二列</h2>
                    <p>学的不仅是技术，更是梦想</p >
                    <p>再牛逼的梦想，也抵不住你的坚持</p >
                    </div>
                    <div class="col-md-3 col-xs-12 col-sm-6">
                    <h2>第三列</h2>
                    <p>学的不仅是技术，更是梦想</p >
                    <p>再牛逼的梦想，也抵不住你的坚持</p >
                    </div>
                    <div class="col-md-3 col-xs-12 col-sm-6">
                    <h2>第四列</h2>
                    <p>学的不仅是技术，更是梦想</p >
                    <p>再牛逼的梦想，也抵不住你的坚持</p >
                    </div> 
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